CN1124992A - Pneumatic instrument particle trap - Google Patents

Pneumatic instrument particle trap Download PDF

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Publication number
CN1124992A
CN1124992A CN94192363A CN94192363A CN1124992A CN 1124992 A CN1124992 A CN 1124992A CN 94192363 A CN94192363 A CN 94192363A CN 94192363 A CN94192363 A CN 94192363A CN 1124992 A CN1124992 A CN 1124992A
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CN
China
Prior art keywords
nozzle
trap
gas
passage
particle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN94192363A
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Chinese (zh)
Inventor
詹姆斯·L·格雷夫尔
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Rosemount Inc
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Rosemount Inc
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Publication date
Application filed by Rosemount Inc filed Critical Rosemount Inc
Publication of CN1124992A publication Critical patent/CN1124992A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y10T137/2322—Jet control type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/794—With means for separating solid material from the fluid

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Nozzles (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Electrostatic Separation (AREA)

Abstract

A transducer (10) which provides a regulated pneumatic output as a function of an electric control input includes a housing (16), a gas regulator (22), and a particle trap (51). The housing (16) has a passage (20) therein, the passage (20) including an inlet for receiving a pressurized gas supply and an outlet. The particle trap (51) is disposed in the passage (20) and includes a trap plate and a trap nozzle which directs gas against the trap plate (56) so as to remove undesired entrained particles from the gas before it reaches the gas regulator (22).

Description

The particle collector of Pneumatic instrument
The present invention has the input of the pressurized gas source of reception and thereby an electric control input signal provides the Pneumatic instrument of an electrical input signal as the gas-pressure adjustable output of function, here this instrument is called the I/P sensor, because the electric control input signal generally is exactly an electric current I and to export generally be a Pneumatic pressure P, particularly the present invention is relevant with the particle collection device that is used for the I/P sensor.
The user of I/P sensor is provided with a high-pressure air source that is used for said apparatus and imports, and this source of the gas often contains the particle of carrying secretly within it.Before these particles make that sensor output is undesired and maybe can damage sensor; above-mentioned I/P sensor just uses the filter of various models that these particles are removed from pneumatic circuit, can make the output of I/P sensor undesired owing to the aperture on precise part in the particle meeting wear sensor or the obstruction I/P sensor.Filter is commonly used to remove these particles, comprise the combination of silk screen type filter and filter one controlling device, this filter one regulator combination is often directly linked on the I/P sensor housing input hole, these filters play the effect that most of deleterious particle is removed effectively, thereby have improved the reliability of I/P sensor.
Yet in some facility, user's pneumatic source of the gas includes the particle on the sensing unit that can adhere to and accumulate to the I/P sensor, and these particles are called sticky particle here, it is believed that they are by oil droplet, and iron rust and water vapour mix to be formed.
In the present invention, the I/P sensor comprises that one is used to receive the housing of the inlet channel of at least a portion compressed gas source, one includes a gas conditioner of regulating a nozzle and a movable deflecting plate, regulates that nozzle is admitted from the gas of channel outlet and the input of deflecting plate response electric control signal and be placed in particle collector in the path with pneumatic output and one that the regulator nozzle coordinates to regulate sensor mutually.It comprises a collector plate and a trap nozzle, and the size of trap nozzle is made by particle being accumulated in can isolate from gas on the collector plate and do not wanted the particle taken away, and the granule number that arrives gas conditioner like this significantly reduces.It is the outlet of 1 to 2 times of regulator nozzle discharge area that one aspect of the present invention, trap nozzle have a sectional area.A trap nozzle discharge area is 1.4 to 1.7 times of regulator nozzle discharge areas in a most preferred embodiment, flow through trap nozzle when outlet keep a lower pressure drop and keep off back at regulator nozzle place simultaneously with the ejection speed of particle.The present invention on the other hand, passage comprises one first hole and the second wideer hole and housing comprises the convex shoulder between first hole and second hole than first hole.At this respect of the present invention, the trap nozzle is placed in first hole at least in part and collector plate is pressed to convex shoulder, and still in another aspect of this invention, the array of a trap nozzle has replaced the trap nozzle.
Fig. 1 is the phantom of the I/P sensor of an invention, and wherein some element illustrates with the square form;
Fig. 1 a and Fig. 1 b are the zoomed-in views of part among Fig. 1;
Fig. 2 is the block schematic diagram that I/P sensor of the present invention is broken section;
Fig. 3 is the zoomed-in view of getting along 3-3 hatchings among Fig. 1;
Fig. 4 is expression one embodiments of the invention similar in appearance to Fig. 1, but has utilized a baffle plate;
Fig. 5 is equivalent to Fig. 1 a, but represents an optional embodiment of the present invention.
In the accompanying drawings, the parts of carrying out same or similar function adopt same label.
Consult Fig. 1 and Fig. 2 now, sensor 10 receives an at least a portion pressurized gas source 14 and a control signal from current source 12, and provides air pressure output with one with the pressure as the control signal function at outlet 46 places.Pressurized gas source 14 typically has one to be higher than local atmospheric 20 pounds/inch 2(1.4 * 10 5Newton/meter 2) forced air, wherein, can be in the output of outlet 46 place air pressure from being higher than about 3 pounds/inch of local atmospheric pressure 2(2.1 * 10 4Newton/meter 2) to about 15 pounds/inch 2(1.0 * 10 5Newton/meter 2).Power supply 12 is linked circuit 13 in the sensor 10 and can be supplied one from 4 milliamperes to 20 milliamperes variable current, at least a portion current charges sensor 10, and the size of electric current has just represented to lead to the control signal size of sensor 10.In addition, power supply 12 can also provide a digital control signal to sensor 10.
Sensor 10 includes two housing parts 16a, and the shell 16 that 16b forms, this two housing parts 16a, 16b partly are fixed together with the screw (not shown) and separate with sealing gasket 18.Shell 16 comprises the passage 20 that passes in it, and at least a portion is crossed above-mentioned passage by the gas stream of pressurized gas source 14 supplies.
Gas conditioner assembly 22 comprises hole 26,28 pass the nozzle 30 and 32 that the head 24 in it faces toward, a displaceable baffle plate 34 and a driver (pressurized strut 36), this gas conditioner assembly 22 and shell 16 join and and the screw (not shown) be fixed on the housing 16.An O shape circle has reduced the seepage of passage 20 and 26 joints, hole, and nozzle 30 receptions are passed hole 26 and guided the nozzle 32 that faces from the gas of passage 20 and gas into.Baffle plate 34 be placed near the outlet 30a place (seeing Fig. 1 b) of a nozzle 30 thereby and parallel double arrow 40 move with change from nozzle diffusing from throughput be adjusted in atmospheric pressure in the hole 28, as shown in Figure 2, hole 28 also links to each other with the booster amplifier 42 of air pressure, because passage 44 is communicated with, and pressurized gas source 14 is directly guided into booster amplifier 42.Know that from prior art the atmospheric pressure in hole 28 is being controlled the tolerance from source of the gas 14 of passing booster amplifier 42, thus the air pressure in the control output channel 46.
Relate to movable baffle plate 34 and nozzle 30,32 gas conditioner mechanism structure and operate in as a reference the US Patent No 4,534,376 detailed description arranged.Particularly baffle plate 34 preferably has one by bar 35 vertical double-head arrows 40 and nozzle 30 axis and fixing long lead.One example that is used for booster amplifier 42 of the present invention has detailed description in US Patent No 4653,523 as a reference.
The particle carried secretly in flowing gas can be because the inwall of wearing and tearing precise part such as nozzle 30, the front portion of the front of baffle plate 34 and upper surface or nozzle 32 and damage the normal operation of sensor 10 owing to stop up aperture such as nozzle outlet 30a or the nozzle 32a that enters the mouth.As everyone knows, adopt the composite set 48 of an air-strainer and regulator just to remove to these particles of being carried secretly from high-pressure air source 14 of small part at 50 places, inlet opening of sensor 10.Everybody also knows in the passage 20 of nozzle 30 upstreams and to use a sieve filter or net-type filter 52 and still can remove more particles from the air-flow of passage 20.Filter cleaner 52 has a double-layer leaching net assembly of tightly being restrainted by an annular clamp ring by one deck 200 eye mesh screens (press Taylor standard sieve divide) and one deck 50 eye mesh screens.And the major part of the particle of not removed by filter cleaner 48 or 52 only beats in the front portion of baffle plate 34 or nozzle 32, taken away by air-flow then.
Yet, find also to be not enough to remove sticky particle such as 48 and 52 these filter cleaners, it is believed that in these sticky particles to include oil droplet, the combination of rust grain or steam or these compositions, wherein oil droplet and iron rust stem from and are used for the gas compressor of pressurized gas source 14.Some user deliberately oil droplet inject source of the gas 14 as a result these oil droplets will aggregation and the Castor Oil miscellaneous equipment such as the valve of linking source of the gas 14.Sticky particle is debatable to sensor 10, because it not only beat take away at baffle plate 34 and by air-flow and also these viscosity industry also adheres to and aggregation on baffle plate 34, and be highstrung to baffle plate 34 with respect to the position of nozzle outlet 30a at the output pressure in the outlet port of booster amplifier 42, and in fact the accumulation of sticky particle on baffle plate 34 changed the shape and the position of baffle plate 34, and the result forms the undesirable skew of an output pressure under the given electric control signal that adds input.The big or small result that same sticky particle also can reduce nozzle inlet opening 32a in the accumulation that receives nozzle 34 forms output pressure and further changes.
The contraction of nozzle exit orifice 30a makes the air-flow at this place have one to quicken relatively, nozzle 30 is to spray particles comprising sticky particle than higher speed towards baffle plate 34 and nozzle 32 like this, it is believed that the particle that is called " viscosity " in fact has the configuration of an adhesion property, the result is under certain striking velocity, some sticky particles will adhere on the baffle plate simultaneously other sticky particle as common " non-sticky " particle bullet from baffle plate, air current flow speed is faster, and the sticky particle of bigger percentage will adhere on the baffle plate.
In order to reduce the sticky particle number that adheres to and accumulate on the precise part, sensor 10 comprises that one is used for the particle collector 51 of sticky particle, particle collector 51 comprises a nozzle 54 and a plate 56 that is placed in nozzle 30 upstream passageway 20, nozzle 54 is gas-flow deflector 56, nozzle 54 has as shown in Figure 1a a nozzle exit orifice 54a, the size of this exit orifice 54a makes the speed of the particle of carrying secretly at nozzle outlet 54a place be about the speed of nozzle outlet 30a place entrained particles, like this, one sticky particle that adheres to baffle plate 34 will discharge its striking velocity and can not adhere on the plate 56, so plate 56 plays the effect of a this particle collector.And on the other hand, one does not adhere to different sticky particles on the baffle plate 34 also often not on the adhesion sheet 56, only takes away with air-flow after discharging its striking velocity on the contrary.In an embodiment, as depicted in figs. 1 and 2, particle collector 51 is placed in the passage 20, all gases that flow through nozzle 54 also flow through nozzle 30 like this, and the area of nozzle exit orifice 54a (recording in the plane with vertical nozzle 54 axis) is substantially equal to the area of nozzle exit orifice 30a so that reach the particle speed that approximately equates.By generally turning back, air-flow at nozzle 54 places restricts the air-flow at nozzle 30 places, the particle that only adheres to baffle plate 34 is collected on the plate 56, and its benefit is still to remove the sticky particle that bothers most simultaneously from nozzle 30 gas stream upstream because the particle packing on plate 52 keeps very low always.
In an embodiment, particle collector is placed in the passage 44 between the import of input hole 50 and passage 46, the size of nozzle exit orifice 54a accomplishes to make the speed of nozzle outlet port particle that 54a carries secretly, the speed that is about the entrained particles of nozzle outlet port 30a, yet upstream passageway 44 places that particle collector 51 are placed on passage 20 rather than are placed near input hole 50 are favourable, guaranteeing that the gas do not flow through nozzle 30 or baffle plate 34 does not flow through particle collector 51 yet, this particle packing that just makes on the plate 52 of particle collector 51 is low always.So flowing through passage 44 directly brings the sticky particle of booster amplifier 42 into and is not seen as the performance that can reduce sensor 10 significantly.
Best, nozzle 30 and 54 has radially a symmetry around the nozzle axis separately, for a large-scale output pressure is provided, wish that the pressure drop of flowing through passage 20 keeps low, flow through the low pressure drop of nozzle exit orifice 54a in order to keep with respect to the pressure drop of flowing through nozzle exit orifice 30a, still to reach simultaneously particle speed about equally as discussed above, the area of nozzle outlet 54a is about 1 times to 2 times of the area of nozzle outlet 30a preferably, in this scope, preferably select 1.4 to 1.7 times of narrower ranges, nozzle outlet 30a is that one 0.016 ± 0.001 inch (0.41 ± 0.03 millimeter) diameter and nozzle outlet 54a are that the prototype plant of one 0.02 ± 0.001 inch (0.51 ± 0.03 millimeter) diameter can move satisfactorily, in this case, its area is than being (0.020/0.016) 2Or about 1.56.
With reference to Fig. 1 a, passage 20 is at particle collector 51 contiguous porose 20a, 20b, 20c, 20d, in a most preferred embodiment, hole 20a and 20d respectively have 0.062 inch (1.6 millimeters) diameter and hole 20b and 20c have 0.312 inch (7.92 millimeters) diameter and 0.445 inch (11.3 millimeters) diameter respectively.Housing parts 16a has the shoulder 58 between a hole 20b and 20c.Inserting member 60 comprises a flange 62, one sleeves 64 and nozzle 54, and housing parts 16a removably is complementary with housing parts 16b, have only as housing parts 16a and 16b and divide when opening, pad 18 subsequently, O shape circle 66, wire mesh screens 52, plate 56, inserting member 60 and pad 68 can unload and clean and replace.When housing parts mated, housing parts 16a was by pad 18, and O shape encloses 66, and wire mesh screens 52 and plate 56 are pressed to flange 62, again flange 62 are pressed to shoulder 58.
Sleeve 64 is from the flange 62 downward pedestals that extend up to nozzle 54, this nozzle then oppositely extends upward towards flange 62, end face around the top of nozzle exit orifice 54a apart from flange 62 is spaced a distance " d ", herein, plate 56 is flat (as shown in drawings), this is equivalent to apart from d between the impact face of nozzle exit orifice 54a and sticky particle collecting board 56-nozzle/sheet separation, preferably collects those haply and can adhere to particle on the baffle plate 34.Nozzle/sheet separation is similar in appearance to one nozzle/baffle plate gap, minimum range " D " (seeing Figure 1B) between suitable baffle plate 34 in this gap and the nozzle exit orifice 30a in baffle plate 34 stroke range, therefore nozzle/sheet separation and nozzle/baffle plate gap preferably mark without absolute unit such as millimeter but mark with the multiple of the zero dimension dimension of the nozzle exit orifice diameter transverse dimension of equivalent (or under non-circular nozzle exit orifice situation), also promptly be respectively nozzle exit orifice 54a diameter and nozzle exit orifice 30a diameter, in the prototype of above-mentioned operation satisfactorily, nozzle/sheet separation is 2.5 (d is about the diameter of 2.5 times of nozzle exit orifice 54a) and nozzle/baffle plate gap is 1 (D approximates the diameter of nozzle exit orifice 30a).Best, there is the value between one 1/5 times and the 5 times of nozzle/baffle plate gaps nozzle/sheet separation.
Referring now to Fig. 1 a and Fig. 3, nozzle 54 points to plate 56 to air-flow and plate 56 shapes are made round the edge of plate 56 and the inner edge of flange 62 and defined hole 57a, 57b, 57c, 57d.In order to keep a low pressure loss that flows through particle collector 51, the area of adding up of perforate 57a-57d is not less than the area of 10 times nozzle outlet 54a, but for to tackle a great deal of undesirable sticky particle, these stack areas are not more than the area of perforate 57a-57d Upstream section plenum duct, in above-mentioned situation, perforate 57a-57d is the circular area round flange 62 inner edges.
In Fig. 4, an alternative embodiment of the invention is shown, I/P sensor 10a is similar in appearance to I/P sensor 10, except how conventional baffle technology in gas conditioner replaces relative nozzle profile, the upper case portion 16c that revises replaces housing parts 16a and gas conditioner module 22a replacement gas conditioner module 22, the driver 36 of gas conditioner 22a moves a baffle plate inflector with the control signal of response from source of the gas 12 along double-head arrow 40 directions, when baffle plate inflector 34a shifts near the outlet of nozzle 31, at passage 26, through hole 28a and the back pressures that connect in the channel part 20 of this two through hole increase, and retreat from the outlet of nozzle 31 as baffle plate inflector 34a, back pressure in the passage 28a just reduces, as shown in Figure 2, hole 28a is connected to be controlled at the output pressure in amplifier outlet port 46 with air pressure booster amplifier 42 in hole 28 similar modes.Hole 28a links path 20 at tie point 29 places.Conventional baffle plate I/P sensor needs a restrictor.The upstream of hole 28a directly is connected with air pressure booster amplifier 42, in order to cut off high-pressure air source so that hole 28a internal air pressure is variable from hole 28a part.In sensor 10a, nozzle had preferably not only played the effect of gas being pointed to the effect of nozzle in the particle collector of plate 56 but also playing required restrictor.In this embodiment, the size of nozzle 54 outlet is mainly used to the flow restriction that provides necessary, nozzle 54 discharge areas with respect to nozzle 31 discharge areas without any special relationship.Yet when satisfying simultaneously under this condition, from above-mentioned reason, preferably the size of nozzle 54 outlets is as much as possible near the size of the outlet of nozzle 31.
Within the scope of the invention, can do many modifications to embodiment, straight as shown in Figure 4 nozzle 30 can replace curved nozzle 31, and baffle plate inflector 34a can be positioned at the termination of its parallel double arrow 40 and driver 36 can drive roughly to be the above-mentioned baffle plate inflector of deflection flatly, as Fig. 4 finding.Sensor 10a can comprise separately the restrictor in passage 20 and the particle collector of Fig. 5 can be used in I/P sensor 10 and also can be used in I/P sensor 10a.
The used material of the present invention is: the material of inserting member 60 is 30% glass fibre filled nylon; The material of plate 56 is 300 series stainless steels; The material of deflecting plate 34 is a carbonization wolfram steel; The material of nozzle 30,32 is 300 a series of stainless steels; The material of deflecting plate 34a is 300 a series of stainless steels.
Though the present invention describes with reference to most preferred embodiment, as long as without departing from the spirit and scope of the present invention, the professional and technical personnel admits and can modify its form and details, through hole for example, can there be a not necessarily circular section shape in passage and nozzle hole, it is flat that the collecting board of particle collector also needs not to be, and gas conditioner can be made one with housing and not necessarily be contained in the dismountable module.Electric control signal and power supply can use not necessarily electric current and the electric control input signal can draw from the optics control signal of a voltage.

Claims (9)

1. admit a high-pressure air source and an electric control input signal to provide an adjustable air pressure output signal for one, include with function as the electric control input signal:
One has the housing of passage in it, and this passage comprises that one admits the inlet and an outlet of at least a portion high-pressure air source;
One gas conditioner comprise one admit from the regulator nozzle of outlet port gas and a response electric control input signal and with the co-ordination of regulator nozzle so that the movable deflecting plate of gas-pressure adjustable output to be provided;
One particle collector is placed in the passage and comprises a collector plate and trap nozzle, and the trap nozzle points to the trap baffle plate to gas.
2. sensor according to claim 1 is characterized in that trap nozzle size accomplishes so just to have reduced the granule number that arrives gas conditioner by the particle aggregation is not wished the particle carried secretly to isolate from gas on collector plate.
3) sensor according to claim 1 is characterized in that the regulator nozzle has one to have the outlet in first cross section and the trap nozzle has an outlet with second cross section, and second sectional area is 1 to 2 times of first sectional area.
4) sensor according to claim 1 is characterized in that particle collector comprises that one is placed in the inserting member in the passage and comprises the trap nozzle; It is characterized in that passage comprises one first through hole and wideer second through hole than first through hole; Housing comprise one between first and second through holes shoulder and the trap nozzle is placed at least partly in first through hole and the plate of trap is pressed to shoulder.
5. sensor according to claim 4 is characterized in that the plate of trap can unload in housing.
6. sensor according to claim 4 is characterized in that trap has a plate that roughly is X-shaped.
7. sensor according to claim 4 is characterized in that inserting member comprises: one presses to flange and sleeve of flange being linked the trap nozzle of shoulder.
8. sensor according to claim 1, above-mentioned particle collector also comprises:
One trap nozzle array comprises the trap nozzle and has some trap nozzle outlets, it is characterized in that the outlet of some trap nozzles that first sectional area of one stack is arranged and the regulator nozzle has an outlet with second cross section, first sectional area of stack is 1 to 2 times second sectional area.
9. sensor according to claim 1 is characterized in that at junction point, and housing has links the second channel that is named as first passage, and air pressure output is then controlled by the air pressure in second channel; Thereby movable deflecting plate and the co-ordination of regulator nozzle change the air pressure output of sensor and bonding point between trap nozzle and regulator nozzle to change air pressure in the second channel, and the size of this trap nozzle has been accomplished the effect of a restrictor.
10. one admit a high-pressure air source and an electric control input signal to contain so that a sensor pack as the gas-pressure adjustable output of electric control input signal function to be provided:
One has the housing of passage in it, and this passage comprises that one admits the inlet and an outlet of at least a portion high-pressure air source;
One gas conditioner comprise one admit from the regulator nozzle of outlet port gas and a response electric control input signal and with the co-ordination of regulator nozzle so that the movable deflecting plate of gas-pressure adjustable output to be provided;
One collector surface; And
One is positioned at passage and gas is pointed to the trap nozzle of collector surface.
11. sensor according to claim 10 is characterized in that the trap nozzle is located with respect to collector surface and its size accomplishes not wish the particle carried secretly by the particle aggregation is separated on collector surface and from gas., so just reduced the granule number that arrives gas conditioner.
CN94192363A 1993-06-11 1994-05-13 Pneumatic instrument particle trap Pending CN1124992A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/076,820 US5333637A (en) 1993-06-11 1993-06-11 Pneumatic instrument particle trap
US08/076,820 1993-06-11

Publications (1)

Publication Number Publication Date
CN1124992A true CN1124992A (en) 1996-06-19

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CN94192363A Pending CN1124992A (en) 1993-06-11 1994-05-13 Pneumatic instrument particle trap

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US (1) US5333637A (en)
EP (1) EP0707687B1 (en)
JP (1) JP3561522B2 (en)
CN (1) CN1124992A (en)
AU (1) AU7093594A (en)
BR (1) BR9406795A (en)
MX (1) MX9404065A (en)
MY (1) MY111547A (en)
RU (1) RU2126104C1 (en)
SG (1) SG44468A1 (en)
TW (1) TW256872B (en)
WO (1) WO1994029600A1 (en)

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BR9406795A (en) 1996-03-19
EP0707687B1 (en) 1999-09-22
JPH08511604A (en) 1996-12-03
MY111547A (en) 2000-08-30
EP0707687A1 (en) 1996-04-24
RU2126104C1 (en) 1999-02-10
JP3561522B2 (en) 2004-09-02
TW256872B (en) 1995-09-11
SG44468A1 (en) 1997-12-19
AU7093594A (en) 1995-01-03
WO1994029600A1 (en) 1994-12-22
US5333637A (en) 1994-08-02
MX9404065A (en) 1995-01-31

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